test: Port pretty number format test to Busted

spec/pretty_spec.lua

@@ -0,0 +1,40 @@
+local pretty = require("pl.pretty")
+
+describe("pl.pretty.number", function ()
+
+  it("should format memory", function ()
+    local function assert_memory (expected, input)
+      assert.is.equal(expected, pretty.number(input, "M"))
+    end
+    assert_memory("123B", 123)
+    assert_memory("1.2KiB", 1234)
+    assert_memory("10.0KiB", 10*1024)
+    assert_memory("1.0MiB", 1024*1024)
+    assert_memory("1.0GiB", 1024*1024*1024)
+  end)
+
+  it("should format postfixes", function ()
+    local function assert_postfix(expected, input)
+      assert.is.equal(expected, pretty.number(input, "N", 2))
+    end
+    assert_postfix("123", 123)
+    assert_postfix("1.23K", 1234)
+    assert_postfix("10.24K", 10*1024)
+    assert_postfix("1.05M", 1024*1024)
+    assert_postfix("1.07B", 1024*1024*1024)
+  end)
+
+  it("should format postfixes", function ()
+    local function assert_separator(expected, input)
+      assert.is.equal(expected, pretty.number(input, "T"))
+    end
+    assert_separator('123', 123)
+    assert_separator('1,234', 1234)
+    assert_separator('12,345', 12345)
+    assert_separator('123,456', 123456)
+    assert_separator('1,234,567', 1234567)
+    assert_separator('12,345,678', 12345678)
+  end)
+
+
+end)